岩匹菊 yan pi ju

Pyrethrum petraeum C. Shih, Bull. Bot. Lab. N. E. Forest. Inst., Harbin 6: 10. 1980 ["petrareum"].

Subshrubs, ca. 35 cm tall; old branches gray; young branches turning purple-red, sparsely pubescent or glabrous. Lower leaves: petiole ca. 1.5 cm; leaf blade ovate, obovate, or oblanceolate, 2-4 × 1.4-2.5 cm, 2-pinnatipartite, both surfaces glabrous; primary lateral lobes 2- or 3-paired; ultimate lateral lobes 1-paired, obliquely triangular. Distal leaves pinnatifid, small. Synflorescence an irregular flat-topped cyme with 1-3 capitula. Involucre coryliform, 15-20 mm in diam.; phyllaries in 4 rows, abaxially densely pubescent to glabrescent or glabrous, scarious margin dark brown or brown, outer phyllaries narrowly oblanceolate-elliptic, ca. 6 mm, middle and inner ones lanceolate-triangular or elliptic, 7-8 mm, middle ones glabrescent, inner ones glabrous. Ray florets pink; lamina narrowly elliptic, ca. 2 cm, apex 2-denticulate. Achenes ca. 2 mm. Corona 0.1-0.2 mm, divided 1/2 length or to base. Fl. and fr. Aug.

● On rocks of mountain slopes; 1800-2600 m. Xinjiang (Fuyun).